CN101093238A - Circuit for detecting lack of phase of three-phase voltage - Google Patents
Circuit for detecting lack of phase of three-phase voltage Download PDFInfo
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- CN101093238A CN101093238A CN 200610027743 CN200610027743A CN101093238A CN 101093238 A CN101093238 A CN 101093238A CN 200610027743 CN200610027743 CN 200610027743 CN 200610027743 A CN200610027743 A CN 200610027743A CN 101093238 A CN101093238 A CN 101093238A
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Abstract
A circuit used for detecting defect phase of three-phase voltage consists of filtered AC circuit, voltage stabilized tube, amplifier IC8A and IC8B as well as IC8C, and optical coupled circuit for reliably judging out defect phase of three-phase power supply.
Description
Technical field
The present invention relates to a kind of testing circuit, relate in particular to a kind of testing circuit of phase of three-phase voltage.
Background technology
At present three-phase phase shortage circuit often adopt phase voltage and three phase vectors and voltage ratio, direct current does not superpose.Will bring the erroneous judgement that detects zero point disconnected like this.
Summary of the invention
Purpose of the present invention is exactly the testing circuit that a kind of phase of three-phase voltage is provided for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions: a kind of testing circuit of phase of three-phase voltage is characterized in that this circuit comprises filter alternating circuit, stabilivolt, amplifier IC8A, IC8B, IC8C, photoelectric coupled circuit.
Sine wave after the input signal of the input end in the same way of described amplifier IC8A, IC8B, IC8C is exchanged by voltage signal Va, Vb, Vc resistance R 26, R27, R28 and capacitor C 12, C14, the C15 filter in the filter alternating circuit and the voltage after the stabilivolt Z2 voltage stabilizing are formed by stacking.
Sine wave after the input signal of the reverse input end of described amplifier IC8A, IC8B, IC8C is exchanged by voltage signal Va, Vb, Vc resistance R 23, R24, R25 and capacitor C 13 filters in filtering alternating circuit and the voltage after the stabilivolt Z2 voltage stabilizing are formed by stacking.
The input resistance of the input resistance ratio inverse input end of the input end in the same way of described amplifier IC8A, IC8B, IC8C is big.
The output signal of described amplifier IC8A, IC8B, IC8C is the square wave of the positive negative value of band phase sequence.
The output signal of described amplifier IC8A, IC8B, IC8C is given single-chip microcomputer through photoelectric coupled circuit.
Compared with prior art, the present invention judges reliable, easy to detect when detecting the three-phase supply phase shortage.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, a kind of testing circuit of phase of three-phase voltage, this circuit comprise filter alternating circuit, stabilivolt, amplifier IC8A, IC8B, IC8C, photoelectric coupled circuit.Sine wave after the input signal of the input end in the same way of described amplifier IC8A, IC8B, IC8C is exchanged by voltage signal Va, Vb, Vc resistance R 26, R27, R28 and capacitor C 12, C14, the C15 filter in the filter alternating circuit and the voltage after the stabilivolt Z2 voltage stabilizing are formed by stacking; Sine wave after the input signal of the reverse input end of described amplifier IC8A, IC8B, IC8C is exchanged by voltage signal Va, Vb, Vc resistance R 23, R24, R25 and capacitor C 13 filters in filtering alternating circuit and the voltage after the stabilivolt Z2 voltage stabilizing are formed by stacking; The input resistance of the input resistance ratio inverse input end of the input end in the same way of described amplifier IC8A, IC8B, IC8C is big; The output signal of described amplifier IC8A, IC8B, IC8C is the square wave of the positive negative value of band phase sequence; The output signal of described amplifier IC8A, IC8B, IC8C is given single-chip microcomputer through photoelectric coupled circuit; Just often detected three signals simultaneously any two for just, all the other one for negative or any two all the other one for just for negative, during phase shortage, detected three-phase output signal is simultaneously for being to bear just or simultaneously.
Claims (6)
1. the testing circuit of a phase of three-phase voltage is characterized in that, this circuit comprises filter alternating circuit, stabilivolt, amplifier (IC8A, IC8B, IC8C), photoelectric coupled circuit.
2. the testing circuit of a kind of phase of three-phase voltage according to claim 1, it is characterized in that and electric capacity (C12, C14, C15) is filtered sine wave after exchanging to the input signal of the input end in the same way of described amplifier (IC8A, IC8B, IC8C) and the voltage after stabilivolt (Z2) voltage stabilizing is formed by stacking through the resistance (R26, R27, R28) of filter in the alternating circuit by voltage signal (Va, Vb, Vc).
3. the testing circuit of a kind of phase of three-phase voltage according to claim 1, it is characterized in that and electric capacity (C13) is filtered sine wave after exchanging to the input signal of the reverse input end of described amplifier (IC8A, IC8B, IC8C) and the voltage after stabilivolt (Z2) voltage stabilizing is formed by stacking through the resistance (R23, R24, R25) of filter in the alternating circuit by voltage signal (Va, Vb, Vc).
4. the testing circuit of a kind of phase of three-phase voltage according to claim 1 is characterized in that, the input resistance of the input resistance ratio inverse input end of the input end in the same way of described amplifier (IC8A, IC8B, IC8C) is big.
5. the testing circuit of a kind of phase of three-phase voltage according to claim 1 is characterized in that, the output signal of described amplifier (IC8A, IC8B, IC8C) is the square wave of the positive negative value of band phase sequence.
6. the testing circuit of a kind of phase of three-phase voltage according to claim 1 is characterized in that, the output signal of described amplifier (IC8A, IC8B, IC8C) is given single-chip microcomputer through photoelectric coupled circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610027743 CN101093238A (en) | 2006-06-19 | 2006-06-19 | Circuit for detecting lack of phase of three-phase voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610027743 CN101093238A (en) | 2006-06-19 | 2006-06-19 | Circuit for detecting lack of phase of three-phase voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101093238A true CN101093238A (en) | 2007-12-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610027743 Pending CN101093238A (en) | 2006-06-19 | 2006-06-19 | Circuit for detecting lack of phase of three-phase voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101093238A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614795B (en) * | 2009-07-21 | 2011-04-27 | 北京中纺锐力机电有限公司 | Default-phase signal detection circuit for three-phase power |
| CN102621404A (en) * | 2012-03-27 | 2012-08-01 | 厦门科华恒盛股份有限公司 | Lacking phase detecting circuit for three-phase voltage of system without zero lines |
| CN107340420A (en) * | 2017-07-19 | 2017-11-10 | 广东美的暖通设备有限公司 | Detecting voltage by three phase circuit and air conditioner |
| CN108614164A (en) * | 2016-12-09 | 2018-10-02 | 上海大郡动力控制技术有限公司 | Electric vehicle permanent magnet synchronous motor three-phase current phase shortage diagnostic method |
-
2006
- 2006-06-19 CN CN 200610027743 patent/CN101093238A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614795B (en) * | 2009-07-21 | 2011-04-27 | 北京中纺锐力机电有限公司 | Default-phase signal detection circuit for three-phase power |
| CN102621404A (en) * | 2012-03-27 | 2012-08-01 | 厦门科华恒盛股份有限公司 | Lacking phase detecting circuit for three-phase voltage of system without zero lines |
| CN108614164A (en) * | 2016-12-09 | 2018-10-02 | 上海大郡动力控制技术有限公司 | Electric vehicle permanent magnet synchronous motor three-phase current phase shortage diagnostic method |
| CN108614164B (en) * | 2016-12-09 | 2021-10-01 | 上海大郡动力控制技术有限公司 | Three-phase current open-phase diagnosis method for permanent magnet synchronous motor of electric automobile |
| CN107340420A (en) * | 2017-07-19 | 2017-11-10 | 广东美的暖通设备有限公司 | Detecting voltage by three phase circuit and air conditioner |
| CN107340420B (en) * | 2017-07-19 | 2023-11-28 | 广东美的暖通设备有限公司 | Three-phase voltage detection circuit and air conditioner |
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